<?php
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */


namespace Aliyun\ApiGatewaySign\Util;
/**
 * 集合对象的元素处理
 */
class DictionaryUtil
{
    public static function Add($dic, $key, $value)
    {
        if (null == $value) {
            return;
        }
        if (null == $dic) {
            $dic = [];
        }
        foreach ($dic as $itemKey => $itemValue) {
            //区分大小写
            if ($itemKey == $key) {
                $dic[$key] = $itemValue;
                return;
            }
        }
        $dic[$key] = $value;

    }

    public static function Get($dic, $key)
    {
        if (array_key_exists($key, $dic)) {
            return $dic[$key];
        }

        return null;
    }

    public static function Pop(&$dic, $key)
    {
        $value = null;
        if (array_key_exists($key, $dic)) {
            $value = $dic[$key];
            unset($dic[$key]);
        }

        return $value;
    }
}